Catalyst for production of aromatic hydrocarbons

Abstract

The catalyst is an L-type zeolite with platinum supported thereon, which is then treated with a halogen-containing compound. The catalyst has a long catalyst life and is extremely useful for the preparation of aromatic hydrocarbons from aliphatic hydrocarbons. The process using the catalyst provides a production of aromatic hydrocarbons with a high yield.

What is claimed is: 
     
       1. A catalyst produced from an L-type zeolite by supporting platinum on an L-type zeolite and halogenating the L-type zeolite with platinum supported thereon with a halogen-containing compound. 
     
     
       2. A catalyst as claimed in claim 1, wherein the amount of platinum supported thereon ranges from 0.1% to 5.0% by weight on the basis of the total weight of the catalyst. 
     
     
       3. A catalyst according to claim 1 wherein said halogen-containing compound is selected from the group consisting of fluorine-containing compounds, chlorine-containing compounds, and fluorine- and -chlorine-containing compounds. 
     
     
       4. A catalyst as claimed in claim 3, wherein the halogen-containing compound is a fluorine-containing compound. 
     
     
       5. A catalyst as claimed in claim 3, wherein the halogen-containing compound is a chlorine-containing compound. 
     
     
       6. A catalyst as claimed in claim 3, wherein the halogen-containing compound is a fluorine- and chlorine-containing compound. 
     
     
       7. A catalyst according to claim 3 wherein said fluorine- and chlorine-containing compounds are selected from the group consisting of trichloromonofluoromethane, dichlorodifluoromethane, monochlorotrifluoromethane, dichloromonofluoromethane, monochlorodifluoromethane, trifluoromethane, tetrafluoromethane, 1,1,2-trichloro-1,2-trifluoroethane, and 1,2l-dichloro-1,1,2,2-tetrafluoroethane. 
     
     
       8. A catalyst as claimed in claim 7, wherein the halogen-containing compound is monochlorotrifluoromethane, difluorodichloromethane or 1,2-dichloroethane. 
     
     
       9. A catalyst as claimed in claim 1, wherein treatment with the halogen-containing compound is carried out at 80° C. to 600° C. for 1 minute to 20 hours.